Saint Charles Quarry: Yellow Calcite & Green Calcite Rockhounding in Saint Charles County, Missouri

Updated June 2026

Saint Charles Quarry is a mapped rockhounding spot in Saint Charles County, Missouri. Reported finds include yellow calcite, green calcite, chert nodules, dolomite, fluorite, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Saint Charles County
State: Missouri
Nearest road: Arena Parkway
Postcode: 63303
Coordinates: 38.75040, -90.50948

Geology at Saint Charles Quarry

This spot sits on ground mapped as limestone that formed roughly 360 to 325 million years ago. Limestone like this typically forms in ancient seas, so marine fossils such as brachiopods, corals, and crinoids tend to weather out of fresh exposures.

Age: 360–325 Ma (Mississippian)
Rock types: limestone
Elevation: 500 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Saint Charles Quarry

Best months: February to November. Typical highs run 88°F in midsummer and 39°F in midwinter, with winter lows near 22°F.

Climate normals: NOAA 1991-2020 monthlies, ST CHARLES ELM PT station (4 mi away).

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Saint Charles Quarry

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Saint Charles Quarry.

Across the state line from Saint Charles Quarry

Saint Charles Quarry is close enough to the Missouri border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Saint Charles Quarry FAQ

Where is Saint Charles Quarry?+

Saint Charles Quarry is in Saint Charles County, Missouri, at 38.75040, -90.50948. Nearest road: Arena Parkway.

What rocks and minerals can you find at Saint Charles Quarry?+

Saint Charles Quarry is reported to produce Yellow Calcite, Green Calcite, Chert Nodules, Dolomite, Fluorite, Fossils.

Is collecting allowed at Saint Charles Quarry?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Saint Charles Quarry?+

A rock hammer, a cold chisel, safety glasses, and newspaper or foam for wrapping finds cover most fossil ground. A trowel and a sieve help in soft exposures.

When is the best time to visit Saint Charles Quarry?+

The most comfortable months at Saint Charles Quarry are February to November.

How do I get to Saint Charles Quarry?+

Open the directions link to navigate to 38.75040, -90.50948 in Google Maps. The nearest road is Arena Parkway.

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Open Saint Charles Quarry on the map

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